Zachary Anderson
103881d01c
i.e. #ifndef VM_WHATEVER -> #ifndef RUNTIME_VM_WHATEVER This lets us remove a hack from the PRESUBMIT.py script that existed for reasons that are no longer valid, and sets us up to add some presubmit checks for the GN build. R=asiva@google.com, rmacnak@google.com Review URL: https://codereview.chromium.org/2450713004 .
57 lines
1.8 KiB
C++
57 lines
1.8 KiB
C++
// Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef RUNTIME_VM_BRANCH_OPTIMIZER_H_
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#define RUNTIME_VM_BRANCH_OPTIMIZER_H_
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#include "vm/allocation.h"
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namespace dart {
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class FlowGraph;
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class JoinEntryInstr;
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class Zone;
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class TargetEntryInstr;
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class Value;
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class BranchInstr;
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// Rewrite branches to eliminate materialization of boolean values after
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// inlining, and to expose other optimizations (e.g., constant folding of
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// branches, unreachable code elimination).
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class BranchSimplifier : public AllStatic {
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public:
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static void Simplify(FlowGraph* flow_graph);
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// Replace a target entry instruction with a join entry instruction. Does
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// not update the original target's predecessors to point to the new block
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// and does not replace the target in already computed block order lists.
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static JoinEntryInstr* ToJoinEntry(Zone* zone,
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TargetEntryInstr* target);
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private:
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// Match an instance of the pattern to rewrite. See the implementation
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// for the patterns that are handled by this pass.
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static bool Match(JoinEntryInstr* block);
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// Duplicate a branch while replacing its comparison's left and right
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// inputs.
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static BranchInstr* CloneBranch(Zone* zone,
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BranchInstr* branch,
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Value* new_left,
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Value* new_right);
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};
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// Rewrite diamond control flow patterns that materialize values to use more
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// efficient branchless code patterns if such are supported on the current
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// platform.
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class IfConverter : public AllStatic {
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public:
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static void Simplify(FlowGraph* flow_graph);
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};
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} // namespace dart
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#endif // RUNTIME_VM_BRANCH_OPTIMIZER_H_
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